131 



4. Aepfelsaurer Harnstotf. €4 Hg 65 -I- CH^ N^ B. Monoclin. 

 Beob. Fl. (100) (001) (101) (Til) (21 0^; (ToO) (111) = 70", (100) 

 (101) = 38" 40', (111) ill) = 104"40'. 



a : b : c = I'Tll : 1 : lo63, ac = 74«50'. 



5. Tartersanrer Harnstoff. O^HgOo + 2€H4N2e. Isoclin. 

 Beob. FL (100) (010) (110) (Oil) (HI); (110) (llo) = 109« 16', 

 (Oil) (Oil) = 88° 28'. 



a : b : c r= 1-409 : 1 : 0-973. 



6. Parabansaurer Harnstoff. €3 H.2 N^Og -|- OHiNj©. Isoclin. 

 Beob. Fl. (010) (110) (Oil); (010) (110) = 51»44', (010) (Oil) 

 = 45" 24'. 



a : b : c = 0-789 : 1 : 0-986. 



7. Gallussaurer Harnstoff. G^HqQ^ + OH^Na©. Monoclin 

 Beob. Fl. (001) (110) (Oil). (110) (iTO) == 88"56', (001) (110) 

 = 76«32', (Oil) (Oil) = 86"32'. 



a : b : c = 1-038 : 1 : 0-996, ac = 70^1 57'. 



8. Citronensaurer Harnstoff. €g Hg G^ -f 2eH4 Nj 6. Triclin. 

 Beob. Fl. (100) (010) (001) (110) (1 TO) (Oil) (III); (100) (010) 

 = 83"20' (010) (001) = 86°40' (100) (001) = 74"56 (001) (U.l) 

 = 58*34' (100) (111) == 60" 20'. 



a : b : c = 0-7659 : 1 : 1-5934, a = 82"55', /3 = 73" 43', 



y = 82" 42'. 

 Wird einer Commission zugewiesen. 



Selbstverlai; der kais. Akad. der Wissengchafteu In Wieii. 

 Buchdruckerei von Carl Gerold's .Solin. 



